This paper proposes a method of installing a garbage bag to a trash can using a dual-armed robot. The proposed method divides this task into two phases: inserting a garbage bag into the can and turning over the edges of the bag. In the former phase, a stick is used to insert the bag into the can to make the insertion smooth. In the latter phase, the garbage bag is placed in the trash can by sliding the bag on the edge of the can after putting the fingers through the handles of the bag. Experiments using Two type of garbage bags and five types of trash cans were conducted to verify the effectiveness of the proposed method.